4W12 3001 RPO DEFINITIONS BS4 INSULATION CAB BACK PANEL X U73 ANTENNA F XED r U75 ANTENNA POWER CHROME Z49 MANDATORY CANADIAN BASE EQUIPMENT MOD FICAT ONS CANAD AN 42 I I 7 V V 1993 GENERAL MOTORS SERVICE PARTS OPERATIONS BUICK 45W 12 000 GROUP 12 92 2 93